Onmeetbarediepgat is one of the major caves in the Quaternary limestone formations in the district of Bredasdorp in the Western Cape Province of South Africa.
The name in Afrikaans means "Immeasurably deep hole".
A small hole leads into a substantial cave system, which has been explored since the 1950s, mainly by cavers belonging to the South African Spelaeological Association (SASA).
Entry to distant parts of the cave is hindered by sumps.
This Western Cape location article is a stub.